docs: def fmt_number(p):
      """Format a number.
  
      It will be printed as a fraction if the denominator isn't too big and as a
      decimal otherwise.
      """
      formatted = '{:n}'.format(p)
  
      if not config.PRINT_FRACTIONS:
          return formatted
  
      fraction = Fraction(p)
      nice = fraction.limit_denominator(128)
      return (
          str(nice) if (abs(fraction - nice) < constants.EPSILON and
                        nice.denominator in NICE_DENOMINATORS)
          else formatted
      )